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Twin Screw Extrusion of DDGS-Based Aquaculture Feeds
Journal of the World Aquaculture Society (2010)
  • S. Kannadhason, South Dakota State University
  • Kurt A. Rosentrater, United States Department of Agriculture
  • Kasiviswanathan Muthukumarappan, South Dakota State University
  • Michael L. Brown, South Dakota State University
Abstract

Six isocaloric (3.65 kcal/g), isonitrogenous (35% dry-basis [db] protein), ingredient blends were prepared with 0, 17.5, 20, 22.5, 25, and 27.5% distiller’s dried grains with solubles (DDGS) and other ingredients (soybean meal, corn, fish meal, whey, soybean oil, vitamin and mineral mix). The blends were moisture balanced to 15% db, then extruded in a twin screw extruder using a 2 mm die at 190 rpm, and a 3 mm die at 348 rpm. Analyses of the extrudates included moisture content, expansion ratio, unit density, bulk density, sinking velocity, color (L*, a*, and b*), water absorption, water solubility, and pellet durability indices. Increasing the DDGS level from 0 to 17.5% db resulted in decreased expansion ratios by 14.8 and 23.5% for the products extruded using a 2 and 3 mm die, respectively. No significant difference in expansion ratio existed for DDGS levels between 17.5 and 27.5% db for either die. The water solubility index (WSI) of the extrudates increased (25.2 and 24.0%) as the DDGS increased from 0 to 27.5% db for each die. The 0% DDGS had the highest expansion ratio and the lowest unit density, bulk density, and sinking velocity. The extrudates that contained 20 and 27.5% DDGS had the highest durability and sinking velocity values.

Publication Date
February, 2010
Publisher Statement
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Citation Information
S. Kannadhason, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan and Michael L. Brown. "Twin Screw Extrusion of DDGS-Based Aquaculture Feeds" Journal of the World Aquaculture Society Vol. 41 Iss. S1 (2010)
Available at: http://works.bepress.com/kurt_rosentrater/169/